[gn] port ab17ecd

Author: nico

llvm/utils/gn/secondary/compiler-rt/lib/scudo/standalone/BUILD.gn

@@ -20,6 +20,10 @@ source_set("sources") {
     "combined.h",
     "common.cpp",
     "common.h",
+    "condition_variable.h",
+    "condition_variable_base.h",
+    "condition_variable_linux.cpp",
+    "condition_variable_linux.h",
     "crc32_hw.cpp",
     "flags.cpp",
     "flags.h",

llvm/utils/gn/secondary/compiler-rt/lib/scudo/standalone/tests/BUILD.gn

@@ -14,6 +14,7 @@ unittest("ScudoUnitTest") {
     "chunk_test.cpp",
     "combined_test.cpp",
     "common_test.cpp",
+    "condition_variable_test.cpp",
     "flags_test.cpp",
     "list_test.cpp",
     "map_test.cpp",